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Structure and evolution of supernumerary chromosomes in the Pacific giant salamander, Dicamptodon tenebrosus

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Abstract

We examined the genetic make-up and plausible origins of the supernumerary (B) chromosomes of the Pacific giant salamander, Dicamptodon tenebrosus, from the Pacific Northwest of North America. These salamanders have variable numbers of B chromosomes, from 0 to 10 per individual. Salamanders from the most southerly and northerly regions of the species' range have lower average numbers of B chromosomes than salamanders in the middle of the range. To assess how the supernumerary chromosomes originated in D. tenebrosus, B chromosome DNA was isolated by microdissection and amplified by degenerate oligonucleotide-primed PCR. The B chromosome DNA hybridized similarly to genomic DNA from individuals of D. tenebrosus and the related species D. copei and D. ensatus, thus demonstrating that the supernumerary chromosomes were derived from the normal chromosome complement. Unique hybridization bands in both D. copei and D. tenebrosus suggest that the shared sequences have evolved independently.

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Authors and Affiliations

  1. Redpath Museum, McGill University, 859 Sherbrooke Street West, Montreal, Quebec, H3A 2K6, Canada

    Jacquelyn N. Brinkman & David M. Green

  2. Department of Biology, Hartwick College, Oneonta, New York, 13820-4020, USA

    Stanley K. Sessions

  3. Department of Genetics, The University of Adelaide, SA, 5005, Australia

    Andreas Houben

Authors
  1. Jacquelyn N. Brinkman
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  2. Stanley K. Sessions
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  3. Andreas Houben
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  4. David M. Green
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Brinkman, J.N., Sessions, S.K., Houben, A. et al. Structure and evolution of supernumerary chromosomes in the Pacific giant salamander, Dicamptodon tenebrosus . Chromosome Res 8, 477–485 (2000). https://doi.org/10.1023/A:1009215621509

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  • DOI: https://doi.org/10.1023/A:1009215621509

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